FR2873575A1 - Coated powder for use in cosmetics, contains lipoamino acid composition containing N-acyl structure of amino acids e.g. proline, alanine, glycine, aspartic acid and glutamic acid and 12-18C fatty acid, which coats powder - Google Patents

Abstract

A lipoamino acid composition coated powder contains a N-acyl structure of amino acid and 12-18C fatty acid which covers a powder for cosmetics. The N-acyl structure of amino acids are (a) proline and hydroxy proline, (b) alanine, glycine and sarcosine, and (c) aspartic acid and glutamic acid. An independent claim is also included for cosmetics, which is blended with 0.1 wt.% or more of coated powder.

Description

The present invention relates to a novel coated powder which can be

  used in cosmetics and a new cosmetic product that contains it. More particularly, the present invention relates to a powder

  coating which can be used in cosmetics and which is coated with a mixture (lipoamino acid composition) comprising Nacyl derivatives (also including a salt form) of the amino acids specified in sections (1) to ( 3) and at least one of the fatty acids (and / or their metal salts) having a number of carbon atoms of at least 12 and at most 22, and the cosmetic products containing the powder: ) at least one amino acid selected from proline and hydroxyproline, (2) at least one amino acid selected from alanine, glycine and sarcosine, and (3) at least one amino acid selected from l aspartic acid and glutamic acid.

  More particularly, the coated powders of these blends (lipoamino acid compositions) are not only satisfactory with respect to the aesthetic feel during use, spreading and adhesion to the skin, and dispersibility, which are properties of ordinary coated powders, but also have a pronounced skin-care effect and anti-aging effect. Therefore, cosmetic products that contain it are very useful.

  In recent years, various powders have been incorporated into cosmetics. Powders are summarily classified as organic powders and mineral powders, but many composite powders containing both organic and inorganic powders have recently come onto the market. The effects of the cosmetics containing these powders include the adjustment of the skin color, the concealment of imperfections, freckles, etc., the adjustment of the skin qualities, the contribution of color, the contribution of shine , absorption of sebum, improvement of the touch, protection against ultraviolet rays and infrared rays, anti-inflammatory activity, sedation, a massage effect, an effect preventing the makeup from degrading by separating from skin, etc. However, the disadvantages which result from the incorporation of powders into cosmetics include, mainly in the case of mineral powders, skin irritation caused by a powdery sensation on the skin, a physical irritation caused during application to the skin, the appearance of a chemical catalytic activity of the powders, etc., the appearance of dry skin caused by the absorption of the sweat or the sebum of the skin by the powders, a dull color conferred by the impregnation of the powders by sweat or sebum, etc. Cosmetics containing powders include not only make-up products, but also skincare products, sunscreens, shampoos, rinses, hair tonics, hair growth promoters, cleansing agents, antiperspirants, bath products, etc. It is proposed to coat the surface of the particles of the powder incorporated in these products with silicone compounds, fluorinated compounds, esters, fatty acids, waxes, amino acids, peptides, lecithin, polyolefins , coupling agents, surfactants and organic compounds such as water-soluble polymers in order to optimize the functions of the powders and to present them for cosmetic effects.

  Among these coating agents, the amino acids are one of the many components that make up the living organism, and the amino acids obtained by their acylation are likely to exert various physiological activities on the skin. Acylated amino acid-coated powders are believed to have such effects as improving sensation in use, improving skin adhesion, providing hydrophobicity and resistance to abrasion. water, the provision of oleophobia, the improvement of the miscibility with the fatty components, the increase in the duration of the cosmetic effects, the storage stability, the dispersibility and the anti-UV protective power, an excellent biocompatibility, etc., and they have been the subject of many proposals.

  For example, it is mentioned that a powder coated with an N-acylated amino acid amide such as N-lauroyl-L-glutamic acid a, γ-di-n-butylamide has the characteristic of being able to impart hydrophobicity and to have a good adhesion to the skin and a soft touch and also to have a good miscibility with the fat components, because of a high lipophilicity (see for example the Japanese patent publication Kokai JP-A-1 -172312 (pages 3-6, Tables 1 and 2).

  It is mentioned that a powder coated with N-lauroyl-L-lysine has excellent spreadability on the skin, offers an initial and also final aesthetic sensation, and is also excellent for the duration of makeup over time (see, for example, JP-A-9-208427 (pages 3-6, Tables 3 and 4).

  In addition, there is mention of a powder which is doubly coated with an acylated basic amino acid and a fat (eg a fatty acid) having an acidic group (see, for example, JP-A-5-58842 pages 4-9)). This coated powder has hydrophobicity, prevents the makeup from going away because of sebum or other, also improves the ability to spread the cosmetics on the skin and gives a good touch to the skin.

  The Applicant has proposed powders coated with N-acyl-Lglutamic acid, N-acyl-N-methylglycine, N-acyl-N-methyl-R-alanine and their salts (see, for example, JP-A- 58-72512 (pages 4-6)). The cosmetics containing this powder exert a protective function of the skin and have excellent properties of adhesion to the skin, touch and stability.

  The Applicant has improved the coated powders of the N-acylated amino acids above and has described powders coated with mixtures containing N-acyl derivatives of at least 14 amino acids (see, for example, JP-A2000- 212041 (pages 8-22, Fig. 1)). The powders have a very soft feel and feel good when applied to the skin or hair and have excellent biocompatibility.

  Cosmetics are generally intended to make the skin clear and beautiful without altering the physiological activity of a healthy skin. In addition, people want to stay always beautiful and young. Functional cosmetics that fulfill this wish are requested. To meet these demands, cosmetics contain components having a skin care effect and components having an anti-aging effect. However, it has not been proposed for coated powder that offers a good skin care effect and offers an anti-aging effect by improving rough skin.

  Therefore, an object of the invention is to provide a coated powder having a strong skin care effect and a strong anti-aging effect of the skin, and cosmetics containing it.

  The Applicant has conducted diligent research to solve the aforementioned problems and has discovered that cosmetics containing a powder coated with a specific composition of lipoamino acids are quite excellent by the effect of skin care and the effect Anti aging. This discovery led to the realization of the invention.

  Thus, a coated powder that can be used in cosmetic products according to the invention is characterized in that a powder is coated with a mixture (composition of lipoamino acids) comprising N-acyl derivatives (including also the form of salt) of the amino acids specified in the following sections (1) to (3) and at least one of the fatty acids (and / or their metal salts) having a number of carbon atoms of at least 12 and at most 22: (1) at least one amino acid selected from proline and hydroxyproline, (2) at least one amino acid selected from alanine, glycine and sarcosine, and (3) at least one amino acid selected from: minus one amino acid selected from aspartic acid and glutamic acid.

  In a preferred embodiment, the number of carbon atoms of the fatty acid is from 12 to 18.

  The N-acyl group of the N-acylamino acid is a saturated or unsaturated alkyl group (alkenyl or other, which may have a carbon-carbon double and / or triple bond in its molecule) or a hydrocarbon group of alicyclic structure having 8 at 22 carbon atoms. A saturated aliphatic carbonyl group having 12 to 22 carbon atoms is preferable, and more preferably the number of carbon atoms is any number from 12 to 18. The carboxyl group of the amino acids (1) to (3) is in free form or in the form of a salt. Examples thereof are metal salts such as Na, K, Ba, Zn, Ca, Mg, Fe, Zr, Co, Al and Ti, an ammonium salt, onium salts of organic alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, 2-amino-2-methylpropanol, 2-amino-2-methyl-1,3-propanediol and triisopropanolamine. The free form or any of Na, K and polyvalent metal salts is preferable. The free form, salts of Na, K, Ca, Mg and Al or a mixture of them is still preferable.

  The amino acids (1) to (3) of the invention exist in nature or are L-isomers derived from the natural environment. Most amino acids have isomers. In this case, the amino acids can also be used in the form of a mixture or composition as long as they include isomers, namely L-isomers, which exist in nature or are derived from the natural environment. For example, when an amino acid contains a D isomer and an L isomer, an L isomer exists in nature. In the invention, such an amino acid in the form of a DL isomer can be used as long as it contains a naturally occurring amino acid L isomer. The mixture of the N-acylated amino acids used in the invention may further contain other amino acids, an N-acyl derivative of an isomer of an amino acid other than those mentioned above, and other substances. an amino acid and its derivatives as long as it contains the N-acyl derivatives of the amino acids. Their presence is recommendable unless they hinder the effects of the invention.

  The N-acyl derivatives of the amino acids (1) to (3) used in the invention can independently be in the free form or in the form of a salt. When all the N-acylamino acids are in the salt form, the salt forms constituting the respective N-acylamino acids are independent. All or a portion may have the same salt form or different salt forms. The amino acids used as starting materials can be in the form existing in nature (L isomer except for glycine). As indicated above, the form of the mixture is acceptable as long as the true form (isomer) is contained therein, as mentioned above. The mode of production is not particularly limited. Thus, it is possible to use the products obtained by an extraction technique, a synthetic technique and a microbiological production technique, and the amino acids obtained by various techniques such as the hydrolysis techniques of proteins and peptides, etc. The fatty acid and / or its metal salt which is used in the invention is a compound having a number of carbon atoms of at least 12 and at most 22. Specific examples are lauric acid, myristic acid, isomyristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, oleic acid, myristoleic acid, elaidic acid, linoleic acid, linolenic acid, etc. By way of example also, mention is made of coconut oil fatty acids which are a mixture of fatty acids derived from plants, in particular coconut palm. Metals of their metal salts include Na, K, Ba, Be, Ce, Ca, Co, Mg, Fe, Sr, Zn, Zr, Al, Ti, etc. Fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid and coconut oil fatty acids and their salts formed with Na, K, Ca, Al and Mg are preferable. A fatty acid selected from lauric acid, myristic acid, palmitic acid and stearic acid is still preferable.

  The minimum concentration of each component in the mixture of amino acids (1) to (3) N-acyl and fatty acid (and / or its metal salt) used in the invention is 0.5% by weight or more . If the concentration is less than 0.5% by weight, there is no synergistic effect. With regard to the concentrations of the respective components in the preferred mixture with which the strong skincare and anti-aging effects of the skin contemplated in the invention are satisfactorily manifested, that of the N-acylated derivative of the amino acid (1) is 25 to 70% by weight, that of the N-acyl derivative of the amino acid (2) is 5 to 50% by weight, that of the N-acylated derivative of the amino acid ( 3) is 5 to 25% by weight and that of the fatty acid (and / or its metal salt) is 5 to 50% by weight.

  With regard to the powder coating technique, the powder can be coated by any known coating technique that has hitherto been employed to improve the powders used in cosmetics.

  With respect to a powder incorporation technique, the powder may be incorporated by any known technique for incorporation of a powder or coated powder which has hitherto been employed for incorporation into cosmetics .

  The coated powder of the invention is a powder obtained by coating a part or all of the surface of the particles with at least a portion of the powders to be incorporated and used in cosmetics with the mixture (lipo-amino acid composition) of the acylated amino acid and fatty acid. In the invention, the term "lipoamino acid" is a general term for a complex or compound comprising an amino acid and a lipid. The type of bond between an amino acid and a lipid comprises non-covalent bonds such as an ionic bond between the basic side chain of an amino acid and a phosphoric acid group of a lipid, a Van der Waals bond between a hydrophobic side chain of an amino acid and a lipid, covalent bonds such as an ester bond between a carboxyl group of an amino acid and a hydroxyl group of a lipid (example: 3'-o-lysylphosphatidylglycerol) or between a hydroxyl group of an amino acid and a phosphoric acid group of a lipid (eg phosphatidylserine), and an amide linkage between an amino group of an amino acid and a carboxyl group of a fatty acid. In the invention, the N-acyl amino acid is preferable.

  In the invention, the "skin care effect" refers to an effect that imparts a moisturizing effect and maintains the smooth condition of the skin. The active oxygen generated on the skin by external stimulation by ultraviolet rays, chemical substances or by drying, etc., acts by modifying the dermis matrix by decreasing collagen, increasing the denaturation of elastin, etc., by losing its elasticity to the skin. The "anti-aging effect" refers to an effect of restoring the elasticity of the skin by improving the condition of the connective tissues.

  The coated powder of the invention has the maximum of the effects of the invention when it is coated with the mixture. The four components that make up the mixture can be applied separately.

  The specific lipoamino acid composition that is used in the invention can be produced by any known method. It can be produced by a method taught, for example, in WO 98/09611, WO 99/04757 or JP-A-2000-191426. When it can be obtained easily, one can buy a product marketed under the trade name "SEPIFEEL ONE" by SEPPIC, France.

  The powder used in the invention is not particularly limited, and any powders that commonly exist in cosmetics can be used. In addition, it will also be possible to use cosmetic powders that can be developed in the future. Their average particle diameter is preferably from 3000 μm to 0.001 μm, more preferably from 200 μm to 0.01 μm. The particle diameter of these powders is determined from an average value measured by observation with an optical microscope or electron microscope. The diameter of non-spherical particles can be determined from an average value of the sum of large diameter, small diameter, thickness, etc. Examples of the mineral powder include diluent pigments such as mica, sericite, talc, kaolin, synthetic mica, muscovite, phlogopite, epidolite, biotite, lithium mica, calcium carbonate , magnesium carbonate, calcium phosphate, alumina, magnesium oxide, aluminum hydroxide, barium sulfate, magnesium sulfate, silicic acid, silicic anhydride, silicate magnesium, aluminum silicate, aluminum magnesium silicate, calcium silicate, barium silicate, strontium silicate, silicon carbide, a metal salt of tungstic acid, aluminum aluminate, magnesium, magnesium meta-silicate aluminate, chlorohydroxyaluminum, clay, bentonite, zeolite, smectite, hydroxyapatite, ceramic powder, boron nitride and silica; special composite thinning pigments such as Excel Mica, Excel Pearl and Powder La Vie sold by Miyoshi Kasei, Inc.; white pigments such as titanium dioxide, zinc oxide and cerium oxide; colored pigments such as red iron oxide, yellow iron oxide, black iron oxide, chromium oxide, chromium hydroxide, Prussian blue, ultramarine, blue pigment mineral, carbon black, lower titanium oxide, manganese violet, cobalt violet, tar paint dye and natural lacquer dye; glossy pigments such as bismuth oxychloride, mica-titanium, fish scale guanine, a powder obtained by coating synthetic mica with titanium dioxide, a powder obtained by coating silica flakes with dioxide of titanium, such as that sold under the trade name "Metashine" by Nippon Sheet Glass Co., Ltd., a powder obtained by coating alumina flakes with tin oxide and titanium dioxide, a powder obtained by coating aluminum flakes with titanium dioxide, a powder obtained by coating copper flakes with silica, such as that sold by Eckart, USA, a powder obtained by coating bronze flakes with silica and a powder obtained by coating aluminum flakes with silica; finely divided powders having an average particle size of less than 0.1 microns, such as finely divided titanium dioxide, finely divided zinc oxide, finely divided iron oxide and finely divided cerium oxide; and powders having a special particulate form, such as butterfly barium sulphate, petal zinc oxide, and nylon fibers having a large diameter of several millimeters; and other powders such as a luminous powder sold under the trade name "Luminova Series" by Mitsui & Co., Ltd., an aluminum powder, a stainless powder, a tourmaline powder and an amber powder.

  Examples of organic powder include a wool powder, a polyamide powder, a polyester powder, a polyethylene powder, a polypropylene powder, a polystyrene powder, a polyurethane powder, a benzoguanamine powder, a polymethylbenzoguanamine powder , a tetrafluoroethylene powder, a polymethyl methacrylate powder, a cellulose powder, a silk powder, a silicone powder, a silicone rubber powder, a styrene-acrylic copolymer powder, a divinylbenzene-styrene copolymer powder, synthetic resin powders such as a vinyl resin, a urea resin, a phenolic resin, a fluororesin, a silicon resin, an acrylic resin, a melamine resin, an epoxy resin and a polycarbonate resin, a crystalline fibrous powder fine, a starch powder, an acylated lysine powder, a long-chain alkylphosphate metal salt powder elder, a metallic soap powder, a C.I. Yellow Pigment, a C.I. Orange Pigment, etc. Examples of tar dye include Red N 3, Red N 10, Red N 106, Red N 201, Red N 202, Red N 204, Red N 205, Red N 220, Red N 226, Red N 227, Red N 228, Red N 230, Red N 401, Red N 505, Yellow N 4, Yellow N 5, Yellow N 202, Yellow N 203, Yellow N 204, Yellow N 401, Blue N 1, Blue N 2, Blue N 201, Blue N 404, Green N 3, Green N 201, Green N 204, Green N 205, Orange N 201, Orange N 203, Orange N 204, Orange N 206 and Orange N 207. Examples of natural dyes include carmine powders, laccaic acid, carthamine, brazilin, crosine, etc. Regarding the form in which the powder used, one can use the form that is usually incorporated in cosmetics, such as a mixture, a composite or an agglomerated powder. For example, these powders can be used by being complexed or doped as required. Examples thereof are a powder obtained by coating a mineral colored pigment such as red iron oxide with silicic anhydride, a powder obtained by coating nylon with a white pigment, a powder obtained by coating a diluent pigment with a pigment. finely divided white pigment, etc. The type and amount of powder used in cosmetics are suitably chosen depending on the type, function, shape, etc., of the cosmetics. For example, one chooses at least one of the powders mentioned above. Obviously we can use powders that can be developed in the future. The type, the amount used and the method of use can be chosen by any means known for the use of the powders, which exist in the field of cosmetics and also the methods which will be developed in the future.

  In the invention, the amount of the specific lipoamino acid composition applied to the powder varies with the particle diameter, the surface area of the powder, the surface condition of the powder, and so on. This amount is 0.1 to 30%, preferably 1.0 to 10%, based on the powder. If the amount is less than 0.1%, the desired beneficial effects are not achieved. If the composition is applied in an amount greater than 30%, the function of the powder is impaired, and this is also uneconomical.

  For the coating of the powder with the specific lipoamino acid composition, it is possible to use any known technique. For example, a water soluble salt of the specific lipoamino acid composition is dissolved in water, and the powder is added to the resulting solution, and well dispersed therein.

  The dispersion is dehydrated, filtered, washed and dried. A water insoluble lipoamino acid composition is dissolved in a suitable solvent such as methyl ethyl ketone or ethyl acetate, and the solution is mixed with the powder. The solvent is distilled off and the residue is dried to give a coated powder. However, the invention is not limited to these coating techniques.

  In order to improve its affinity for a coating agent or its ability to bond with it, the surface-treated powder may be coated with an oxide or hydroxide of at least one metal selected from aluminum, calcium, magnesium, cerium, silicon, zirconium, titanium, zinc, iron, cobalt, manganese, nickel and tin. In addition, the powder may be pre-coated to produce a synergistic effect of the coating with a silicone, an acylated amino acid, an acylated peptide, a fatty acid, a metal soap, a fluorinated compound, lecithin, a polyalkylene, a silane coupling agent, a ceramide, a dextrin fatty acid ester, an inulin fatty acid ester, etc .; The specific lipoamino acid composition serving as a coating agent in the invention is also very useful as a surfactant for layer A or layer B proposed by the applicant, as described in JP-A- 2001-72527 or 2002-80748.

  The quantity of the coated powders thus obtained which are incorporated into cosmetic products is determined as desired according to the qualities of the cosmetics.

  This amount is from 0.01 to 100% by weight relative to the total composition. One or more of these coated powders may be incorporated, if necessary.

  In the cosmetic products of the invention, the coated powders of the invention can be used to constitute at least a portion of the powders to be incorporated and used in cosmetics, in particular a greater proportion of incorporation is preferable.

  Examples of the cosmetic products containing the powders coated with the specific lipoamino acid composition of the invention include makeup products such as a powder foundation, a liquid foundation, a greasy foundation, a base stick complexion, compacted powder, facial powder, lipstick, lip gloss, red, eye shadow, eyebrow, eyeliner, mascara, nail polish aqueous nails, a fatty nail polish, an emulsion nail polish, a protective layer for varnish and a basecoat for nail polish, skin products such as an emollient cream, a cold cream, a whitening cream, a emulsion, a cosmetic lotion, a beauty lotion, a carmine lotion, a slimming product, a liquid facial lotion, a facial foam lotion, a cream facial lotion, a facial lotion in powder form, a makeup remover, a shine in on the body and a shaving product, hair products such as a hair gloss, a hair cream, a hair shampoo, a hair rinse, a hair dye and a hair brush, a cream against the blows of hair sun, an antisolar cream, a sedative care product after a sunburn, an emulsion, a soap, a bath product, a perfume, etc. Cosmetic products containing the powders coated with the specific lipoamino acid composition used in the invention may suitably contain a pigment dispersant, an oil, a surfactant, a UV absorber, an antiseptic, an antioxidant, a film-forming agent, a moisturizer, a thickener, a dye, a pigment, a perfume, etc., which are used in the usual or other cosmetics as indicated above, unless they hinder the effects of the invention.

  The invention is described in detail below by means of Examples and Comparative Examples. These examples do not limit the invention in any way.

  Example 1 (Preparation of coating agents) 1-1 Preparation of the coating A 45.5 g lauroylproline, 30.5 g N-lauroylglycine, 5.5 g N-lauroylglutamic acid and 18 g 5 g of palmitic acid are introduced into a glass beaker heated to 65 ° C., dissolved by mixing and then cooled to give a solid material. This solid material is called "coating agent A".

  1-2 Preparation of coating agent B g of dipalmitoylhydroxyproline, 35 g of sodium salt of N-myristoylalanine, 7.5 g of Npalmitoylaspartic acid, 22.5 g of myristic acid and 50 cm3 of water are introduced into a glass beaker and dissolved by being mixed with 50 C, and then cooled to give a paste. This paste is called the "coating agent B".

  1-3 Preparation of the coating agent C 160.0 g of palmitoylproline, 130 g of sodium salt of palmitoylsarcosine, 38 g of potassium palmitoylglutamate, 72 g of magnesium stearate and 200 cm3 of water are introduced into a glass beaker, dissolved by mixing at 75 ° C, and then cooled to give a paste. This paste is called the "coating agent C".

  1-4 Preparation of the coating agent D As a coating agent D, a product bearing the trade name "SEPIFEEL ONE" marketed by SEPPIC, France, is used. The composition is 44.5% by weight of palmitoylproline, 12.5% by weight of palmitoylsarcosine sodium salt, 8.5% by weight of magnesium palmitoylglutamate and 34.5% by weight of palmitic acid.

  Example 2 (Production of Coated Powder 1) g of a powder to be coated and 3 g of coating agent A are introduced into a laboratory mixer equipped with a jacket, and stirred for 30 minutes while the internal temperature the mixture is maintained at 60 ° C. to give a coated powder. As the powder to be coated, four types of powders, mica MJ-V (Merck Japan KK), Powder La Vie (Miyoshi Kasei, Inc.), mica-titanium TIMIRON SUPER RED (Merck Japan KK) and Excel Mica JP- 2 (Miyoshi Kasei, Inc.), and each of these powders is coated by the above process to produce four types of coated powders.

  Example 3 (Production of Coated Powder 2) g of synthetic fluorophosphopite PJDM-9WB (Topy Kogyo KK) are introduced into a mixer-mixer, and mixed with 6 g of the coating agent B and 50 g of hot water at 60 C for 30 minutes. The mixture is then dried in an oven at 105 ° C. for 12 hours and passed through a mill to produce a coated powder.

  Example 4 (Production of Coated Powder 3) 3 kg of finely divided titanium oxide TTO-S-3 (Ishihara Sangyo Kaisha Ltd.) and 350 g of coating agent C are fed into a Henschel heater of 20 liters (Mitsui Mining Co., Ltd.) and stirred for 20 minutes for coating. This mixture is sprayed with a 100 AFG jet mill (Germany: ALPINE), then dried in an oven at 105 ° C. for 7 hours to produce a coated powder.

  Example 5 (Production of Coated Powder 4) 100 g of P-1500 silica beads (Catalysts & Chemicals Industries Co., Ltd. (CLIC)) are introduced into a blender-mixer and blended with 8 g of blending agent. coating D and 60 g of hot water at 80 C for 30 minutes. The mixture is then dried in an oven at 105 ° C. for 15 hours and passed through a mill to produce a coated powder. Similarly, using FSE sericite (Sanshin Mining Ind. Co., Ltd.), JA-46R talc (Asada Milling KK), CR-50 titanium dioxide (Ishihara Sangyo Kaisha Ltd.), Yellow LL-100P (Titanium Kogyo KK), Red R-516P (Titanium Kogyo KK) and BL-100P Black (Titan Kogyo KK), 100 g of each powder are coated with 3 g of a coating agent.

  Comparative Example 1 (Production of Coated Powder 5) Synthetic fluorophlogopite is surface-treated by the process described in (a) of Example 1 of JP-B-1-50202 to produce a powder treated with N-type. myristoyl-L-aluminum glutamate (amount of surface treatment: 3% by weight).

  Comparative Example 2 (Production of Coated Powder 6) Synthetic fluorophlogopite PDM-9WB is coated with N-lauroyllysine by the method of Production Example 1 described in JP-A-867609. The coating process is described below. 5 g of Nlauroyllysine are dissolved in 500 g of water adjusted to a pH of about 12 by dissolving 0.2 g of sodium hydroxide. 95 g of the powder is dispersed to obtain a suspension. 2.5 g of calcium chloride are added to neutralize approximately to a neutral region to precipitate the calcium salt of N-lauroyllysine. The salt formed during the neutralization is removed by being washed with water and the residue is dried at 100 ° C. for 2 hours to produce a synthetic fluorphlogopite treated with N-lauroyllysine.

  Comparative Example 3 (Production of Coated Powder 7) A powder is coated with N-lauroyllysine and palmitic acid by the method of Example 1 described in JP-A-5-58842. The coating process is described below. 100 g of the powder are introduced into a mixer-mixer, a solution of 100 g of calcium chloride in 5000 g of ethanol prepared beforehand is added thereto and the mixture is mixed at room temperature for 2 hours with stirring. Then, the mixture is filtered and washed with water to remove calcium chloride. The residue is then dried to give a powder coated with N-lauroyllysine. 100 g of the resulting coated powder are introduced into a mixer-mixer. A solution of 1.5 g of palmitic acid in 50 g of hexane is added and the mixture is mixed at 60 ° C. for 30 minutes. Then, the hexane is distilled off at 60 ° C. under reduced pressure, and the residue is dried at 100 ° C. for 1 hour to give a powder coated with N-lauroyllysine and palmitic acid. The powders to be coated are of 12 types: sericite FSE, mica MJ-V, talcum JA-46R, titanium dioxide CR-50, Yellow LL-100P, Red R-516P, Black BL-100P, Powder Life, fluorine PDM-9WB synthetic phlogopite, TIMIRON SUPER RED mica-titanium, silica beads and Excel Mica. The amount of coating is the same as in the Example above. This gives 12 types of coated powders.

  The coated powders of the invention, as obtained above, and the coated powders of Comparative Examples which have been treated in the usual manner are evaluated by the following test methods.

  Checking the skin care effect The skin care effect referred to in the invention refers to an effect which imparts a moisturizing effect and maintains the smooth condition of the skin. This effect is verified by the following method.

  Test method: A 10% solution of sodium lauryl sulphate is applied and spread on the curved side of the forearm and covered for 30 members of a jury with healthy skin, for 2 hours to prepare a model of rough skin. As the applied sample, a mixture of Vaseline (Nikko Rika K.K.) and a coated powder was formed in a ratio of 1: 1% by weight. As a comparative sample, a pre-coated powder was used in each Example bangs uncoated powder in the test. In addition, cargue control blank, Vaseline alone. A 2 cm x 4 cm application site is provided on the rough skin area and the sample is applied at 2 mg / cm 2.

  This operation is performed twice a day, in the morning and in the evening, and continued for 5 days. The moisture content of the keratin on the skin is measured using SKICON-100 (I. B. S. K.K.). For the moisturizing effect, a ratio of the low frequency conductivity before application and the low frequency conductivity after 5 days of application is determined as the relative conductivity calculated as described below. In addition, the rough skin is due to a disturbance of the top of the skin and the interpapillary groove. The smooth sensation or rough sensation on the skin's surface is assessed by the members of the jury themselves. The evaluation criterion is noted as follows to obtain a total value.

  Relative Conductivity = Low Frequency Conductivity After Application / Low Frequency Conductivity Before Application x 10 100 (%) Enhanced - +1 Unchanged - 0 Degraded - -1 Verification of Anti-aging Effect Active Oxygen Generated by External Stimulation by Radiation ultraviolet and chemical substances or by drying, etc., acts by modifying the matrix of the dermis by decreasing collagen, increasing the denaturation of elastin, etc., which causes loss of elasticity of the skin. The anti-aging effect of the invention refers to the effect of restoring the elasticity of the skin by improving the condition of the connective tissues. This effect is verified by the following method.

  Test method: Considering a test site of the skin care effect, the ratio of the elasticity (relative elasticity) of the skin before application and the elasticity of the skin after 5 days of application is measured using a cutometer (Cutometer SEM 474 manufactured by COURAGEKHZN A electronic GnbH). The relative elasticity is calculated by the following formula to obtain an average.

  Relative Elasticity = Post-Application Elasticity / Pre-Application Elasticity x 100 (%) For the coated powders and uncoated powders produced in Examples 2 to 5 and Comparative Examples 1 to 3, the skin care effect (relative conductivity and improved condition of rough skin) is shown in Table 1, and the anti-aging effect (relative elasticity) in Table 2.

TABLE 1

  Coated Powder Uncoated Powder Conductivity Skin Condition Conductivity Rough Relative Rough Relative Surface Condition Mica in Example 2 135% +21 100% 0 Powder The Life of Example 2 137% + 19 103% 0 Mica-titanium Example 2 135% + 20 95% -6 Excel Mica of Example 2 137% +25 100% 0 Synthetic phlogopite fluorine of 135% + 25 100% +2

Example 3

  finely divided titanium dioxide of 133% +18 93% -8

Example 4

  Silica beads of Example 5 134% + 92% -9 Sericite of Example 5 138% + 101% Talc of Example 5 136% + 22% titanium dioxide of Example 5 139% +18 99% -2 Iron Yellow Oxide of Example 5 137% +19 98% -2 Red iron oxide of Example 5 135% +20 97% -1 Iron oxide of Example 133% +18 99% -5 Synthetic Fluoroplogopite 101% Comparative Example 1 Synthetic Phosphopite Fluorite 103% Comparative Example 2 Sericite of Comparative Example 3 100% +3 Mica of Comparative Example 3 102% +2 - Talc of Comparative Example 3 102% +3 - - Titanium dioxide of Example 99% +1 - Comparative 3 Yellow iron oxide of Example 100% 0 - - Comparative 3 Red Iron Oxide of Example 100% 0 - - Comparative 3 Black Iron Oxide of Example 98% 0 - Comparative 3 Powder The Life of Example 102% 0 - - Comparative 3 102% Synthetic Fluor-phlogopite + 5 - Comparative Example 3 Mica-titanium of Comparative Example 3 101% +1 Silica balls of Example 99% -2 Comparative Example 3 Excel Mica of Comparative Example 101% +2 - Application of vaseline alone 101% +1

TABLE 2

  Relative Elasticity Coated powder Mica uncoated powder of Example 2 138% 98% Powder The life of Example 2 139% 103% Mica-titanium of Example 2 132 / O 96% Excel Mica of Example 2 % 100% Synthetic Fluorphlogopite of Example 3 137% finely divided titanium dioxide of Example 4 137% 97% Silica beads of Example 5 135% 93% Sericite of Example 5 131% 96 Talc Example 5 139% 99% titanium dioxide of Example 5 134% 101% Yellow iron oxide of Example 5 133% 99% Red iron oxide of Example 5 138% 98% Iron black oxide of Example 5 138% 100% Synthetic Fluorphlogopite of Comparative Example 1 100% - Synthetic Fluor-phlogopite of Comparative Example 2 102% - Sericite of Comparative Example 3 103% - Mica of Example Comparative 3 103% - Talc of Comparative Example 3 101% - Titanium Dioxide of Comparative Example 3 100% - Iron Yellow Oxide of Comparative Example 3 100% - Red Iron Oxide of Example Co Comparative 3 101% Black Iron Oxide of Comparative Example 3 99% - Powder The Life of Comparative Example 3 103% - Synthetic Fluor-phlogopite of Comparative Example 3 103% - Mica-titanium of Comparative Example 3 100% - silica beads of Comparative Example 3 98% - Excel Mica of Comparative Example 3 101% - Application of petroleum jelly alone 102% As can be seen from these results, the coated powders of the invention are excellent both by the skin care effect as shown by the relative conductivity and rough skin condition in Table 1 and by the anti-aging effect shown by the relative elasticity in Table 2.

  Then, formulations are prepared by incorporating the coated powders of the invention.

  Example 6 and Comparative Example 4 (Formation of a compacted powder) Using the coated powders produced in Example 5, a compacted powder described in Table 3 is prepared. For comparison, a product containing the powders is also prepared. ordinary coatings produced in Comparative Example 3.

TABLE 3

  Proportion (%) 1. Sericite coated with Example 5 or Comparative Example 3 52.00 2. Coated Talc of Example 5 or Comparative Example 3 25.00 3. Coated titanium dioxide of Example 5 or Comparative Example 3 EXAMPLE 5 or COMPARATIVE EXAMPLE 38 4. Iron Yellow Oxide Coated with Example 5 or Comparative Example 3 1.25 5. Red Iron Oxide Coated with Example 5 or Example 1 Comparative Example 30.95 Black Coated Iron Oxide of Example 5 or Comparative Example 30 7. Dimethyl polysiloxane (6 cSt) 3.70 8. Squalane 2.75 9. Tri-2 glyceryl ethylhexanoate 4.05 10. SEPICIDE HB * 1 0.30 Preservative sold by SEPPIC, France.

  Process Components 1 to 6 are mixed with a Henschel mixer, then mixed again with a mixture obtained by uniformly mixing the components 7 to 10. The resulting mixture is sprayed with an atomiser, sieved and compressed into a cosmetic case to produce a compacted powder.

  Example 7 and Comparative Example 5 (Preparation of a double-acting powder foundation) A double-acting powder foundation is prepared as described in Table 4. For comparison, a product containing powders is also prepared. ordinary mixes.

24 TABLE 4

  Proportion (%) 1. Sericite coated with Example 5 or Comparative Example 3 32.00 2. Powder The Coated Life of Example 2 or Comparative Example 3 15.00 3. Coated Talc Example 5 or Comparative Example 3 20.00 4. Titanium dioxide coated with Example 5 or Comparative Example 39, 50 5. Coated iron yellow oxide of Example 5 or Comparative Example 3 1.60 6. Red Coated Iron Oxide of Example 5 or Comparative Example 3 0.75 7. Coated Black Iron Oxide of Example 5 or Comparative Example 30 8. Polymethyl methacrylate 5.0 9. Zinc stearate 5.0 10. Octyldodecyl oleate 1.50 11. Squalane 4.50 12. Liquid lanolin 1.50 13. Glyceryl tri-2-ethylhexanoate 3.20 14. SEPICID HB 0.30 Process Components 1 to 9 are mixed with a Henschel mixer and further mixed with a homogeneous mixture of components 10 to 14. The resulting mixture is sprayed with an atomizer, sieved and compressed into a box. er to cosmetics to produce a double-acting foundation.

  Example 8 and Comparative Example 6 (Preparation of Powder Eyeshadow) A powder eye shadow is prepared as described in Table 5. For comparison, a product containing ordinary coated powders is also prepared.

TABLE 5

  Proportion (%) 1. Sericite coated with Example 5 or Comparative Example 3 53.40 2. Excel Mica coated with Example 2 or Comparative Example 3 25.00 3. Mica-titanium coated with Example 5 or Comparative Example 3 7.80 4. Coated Silica Beads of Example 5 or Comparative Example 3 5.50 5. Coated Iron Yellow Oxide of Example 5 or Example 5 Comparative Example 30 0 6. Iron Red Oxide Coated with Example 5 or Comparative Example 3 0.35 7. Coated Black Iron Oxide of Example 5 or Comparative Example 30 8. Sorbitan oleate 1.80 9. Vaseline 1.90 10. Dimethylpolysiloxane 1.90 11. Squalane 1.50 12. SEPICIDE HB 0.30 Process Components 1 to 7, except for mica-titanium, are mixed with a Henschel mixer, and the mixture is then sprayed with an atomizer. The product is mixed with the mica-titanium which is component N 3, and further uniformly mixed with a homogeneous mixture of components 8 to 12. The resulting mixture is sprayed with an atomizer, sieved and compressed into a cosmetic case for produce a powder eye shadow.

  Example 9 and Comparative Example 7 (Preparation of a lipstick) A lipstick described in Table 6 is prepared. For comparison, a product containing ordinary coated powders is also prepared.

26 TABLE 6

  Proportion (%) 1. coated titanium dioxide of Example 5 or Comparative Example 3 1, 50 2. Red iron oxide coated with Example 5 or Comparative Example 3 8.50 3. Balls of coated silica of Example 5 or Comparative Example 3 2.25 4. Red N 201 1.25 5. Castor oil 49.20 6. Octyl-dodecanol 15.50 7. Beeswax 7, 00 8. Ozocérite 5.00 9. Candelilla wax 8.00 10. Camauba wax 1.50 11. Antioxidant 0.20 12. SEPICIDE HB 0.10 Process Components 5 to 10 are melted and mixed uniformly. Components 1 to 4 are added and the mixture is kneaded with a roll mill and dispersed uniformly. Then the dispersion is redissolved and the components 11 and 12 are added thereto. The mixture is poured into a mold and cooled rapidly. When the product is solidified, the resulting product is removed from the mold, placed in a container and passed to the flame to give it a uniform appearance to produce a lipstick stick. Example 10 and Comparative Example 8 (Preparation of a liquid foundation) A liquid foundation was prepared as described in Table 7. For comparison, a product containing ordinary coated powders was also prepared.

27 TABLE 7

  Proportion (%) 1. Powder The Coated Life of Example 5 or Comparative Example 3 7.50 2. Coated Talc of Example 5 or Comparative Example 3 2.50 3. Coated Titanium Dioxide Example 5 or Comparative Example 35, 60 4. Coated Iron Yellow Oxide of Example 5 or Comparative Example 3 1.25 5. Coated Iron Red Oxide of Example 5 Comparative Example 3 0.85 6. Coated Black Iron Oxide of Example 5 or Comparative Example 30.15 Decamethyltetrapentanesiloxane 25.0 8. Dimethylpolysiloxane (6 cSt) 5.00 9. Copolymer dimethylpolysiloxane-polyoxyalkylene 3.80 10. Propylene glycol 3.50 11. Ethanol 8.00 12. Purified water 36.55 13. SEPICID HB 0.30 Process Components 1 to 9 are mixed uniformly. Components 10 to 13 are uniformly mixed and dissolved. During stirring of the aqueous phase components, the oily phase components are added for emulsification to produce a liquid foundation.

  Example 11 and Comparative Example 9 (Preparation of Cream Foundation) A cream foundation as described in Table 8 is prepared. For comparison, a product containing ordinary coated powders is also prepared.

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TABLE 8

  Proportion (%) 1. Powder Coated Life of Example 5 or Comparative Example 3 10, 50 2. Coated Talc of Example 5 or Comparative Example 3 35.85 3. Coated Silica Beads of Example 5 or Comparative Example 3 3.50 4. coated titanium dioxide of Example 5 or Comparative Example 38, 60 5. Iron yellow oxide coated with Example 5 or Comparative Example 3 1.25 6. Iron oxide red coated with Example 5 or Comparative Example 3 0.85 7. Coated black iron oxide of Example 5 or Comparative Example 30 8. Dimethylpolysiloxane (6 cSt) 4.50 10. Squalane 10.50 11. Isononyl isononanoate 6.50 12. Ceresin 6.00 13. Carnauba wax 6.50 14. SEPICIDE HB 0.30 Process Components 8 to 14 are melted and mixed uniformly. Components 1 to 7 are added and mixed and dispersed uniformly. The dispersion is poured into a mold and cooled to produce a cream foundation.

  Example 12 and Comparative Example 10 (Preparation of Emulsion) An emulsion described in Table 9 is prepared. For comparison, a product containing ordinary coated powders is also prepared.

TABLE 9

  Proportion (%) 1. Synthetic phlogopite fluorophore coated with Example 3 or Example 3, 50 Comparative 1 2. Coated silica beads of Example 5 or Comparative Example 3 1.00 3. Myristate isopropyl 3.50 4. Isotridecyl isononanoate 5.50 5. Plant squalane 2.50 6. Decamethylpentacyclotetrasiloxane 2.25 7. SIMULGEL EG * 2 0.50 8. Butylene glycol 5.00 9. Pyrrolidone carboxylate Sodium 2.00 10. Purified water 73.95 11. SEPICIDE HB 0.30 2 Emulsified thickener sold by SEPPIC, France.

  Process Components 1 to 7 are mixed and dispersed uniformly. Components 8 to 11 are uniformly mixed and the oily phase components are added for emulsification to produce an emulsion.

  Example 13 and Comparative Example 11 (Preparation of sunscreen) A sunscreen described in Table 10 is prepared. For comparison, a product containing ordinary coated powders is also prepared.

TABLE 10

  Proportion (%) 1. Finely divided titanium dioxide of Example 4 or Comparative Example 3 15.0 2. Coated silica beads of Example 5 or Comparative Example 3 2.00 3. Neopentanoate isostearyl 5.50 4. Octyl methoxycinnamate 5.00 5. Vegetal squalane 3.00 6. Decamethylpentacyclotetrasiloxane 7.00 7. SIMULGEL A * 3 2.50 8. Propylene glycol 5.00 9. Ethanol 8.00 10 Monosodium glutamate 0.15 11. Purified water 46.55 12. SEPICIDE HB 0.30 x3 Emulsified thickener sold by SEPPIC, France. Process Components 1-7 are mixed and dispersed uniformly. Components 8 to 12 are uniformly mixed and the oily phase components are added for emulsification to produce a sunscreen.

  Example 14 and Comparative Example 12 (Preparation of an eyeliner) An eyeliner described in Table 11 is prepared. For comparison, a product containing ordinary coated powders is also prepared.

31 TABLE 11

  Proportion (%) 1. Powder The finely divided life of Example 2 or Comparative Example 3 10.00 2. Titanium dioxide coated with Example 5 or Comparative Example 3 3.00 3. Oxide coated iron black of Example 5 or Comparative Example 3 3, 50 4. Organic bentonite 0.50 5. Light liquid isoparaffin 67.10 6. Carnauba wax 4.50 7. Beeswax 1, 00 8. Microcrystalline wax 11.00 9. Vaseline 2.00 10. Antioxidant 0.20 11. SEPICIDE HB 0.20 Process Components 1 to 4 and part of component 5 are mixed and dispersed uniformly. The components 5 to 11 are dissolved there hot and the mixture is kneaded with a roll mill and again dissolved hot. The remainder of component 5 is added and the mixture is cooled with stirring to produce an eyeliner.

  Example 15 and Comparative Example 13 (Preparation of an O / W Care Cream) An O / W care cream described in Table 12 is prepared. For comparison, a product containing powders is also prepared. ordinary mixes.

32 TABLE 12

  Proportion (%) 1. Powder The finely divided oxidized Life of Example 2 or Example 10.00 Comparative 3 2. Synthetic phlogopite fluorite coated with Example 3 or Example 3, 00 Comparative 2 3 Beeswax 6.50 4. Ketanol 3.50 5. Hydrogenated Lanolin 8.00 6. Vegetal Squalane 5.0 7. Triglyceride of 2-Ethylhexanoic Acid 4.00 8. Lipophilic Glycerin Monostearate 2.50 9 Polyoxyethylenesorbitan lauric acid monoester (20 EO) 2.00 10. Butylene glycol 5.00 11. Purified water 50.1 12. Antioxidant 0.20 13. SEPICIDE HB 0.20 Process Components 1 to 9 are heated to 80 C and mixed and dispersed uniformly. Components 10 to 13 are dissolved under heat at 80 ° C. The aqueous phase is added to the oily phase with stirring for emulsification, and the emulsion is cooled to 30 ° C. to produce an O / W cream.

  The products of Examples 6 to 15, compared to the products of Comparative Examples 4 to 13, not only provide a satisfactory feel to use and plating ability, but also clearly observe the skin care effect. for the hydration of the skin and the maintenance of the smooth state of the skin, and the anti-aging effect of restoring the elasticity of the skin when the same product is applied regularly to the skin. Thus, we obtain cosmetics that are superior to ordinary products.

  "SEPIFEEL ONE" sold by SEPPIC, France, which has been used as a coating agent of the invention as indicated in the Examples above, is presented as follows in JP-T-2001-510784 (the term "JP-T", as used herein, refers to a published Japanese translation of a PCT patent application). A mixture of N-palmitoylproline, Npalmitoylglutamic acid and N-palmitoylsarcosine or its salt is considered to exert a substance P antagonistic activity and having an anti-inflammatory activity on the skin. This function is part of the concept of the skin care effect and the anti-aging effect referred to in the invention. Therefore, the case where "SEPIFEEL ONE" is incorporated into the product as an additive and the case where it is incorporated in the product in the form of a coated powder is compared. Example 16 and Comparative Example 14 (Powder Foundation) A powder foundation powder described in Table 13 is prepared and compared with a product prepared with ordinary coated powders. The content of "SEPIFEEL ONE" in each product is 3.0

34 TABLE 13

  Proportion (%) Example 16 Comparative Example 14 Incorporation of the powder Incorporation of the coated powder of the coated Example of Comparative Example 3 1. Synthetic phlogopite fluorine 16.00 (Example 3) As on the left 2. Talc 55, (Example 5) 52.00 3. Titanium dioxide 8.50 (Example 5) As on the left 4. Yellow iron oxide 2.10 (Example 5) As on the left 5. Red iron oxide 0.90 (Example 5) 5) As on the left 6. Black iron oxide 0.20 (Example 5) As on the left 7. Silica balls 8.00 (Example 5) As on the left 8. Liquid paraffin 1.50 As on the left 9. Oleate d octyldodecyl 3.50 As left 10. Jojoba oil 1.00 As left 11 SEPIFEEL ONE - 3.00 12. SEPICIDE HB 0.30 As on the left Process Components 1 to 7 are mixed with a Henschel mixer and add to them a mixture obtained by dissolving and uniformly mixing the components 8 to 12 at 80 C, which is still mixed with them. The resulting mixture is sprayed twice with an atomizer, then sieved and compressed into a cosmetic case to produce a powder foundation.

  Example 17 and Comparative Example 15 (Fat Foundation) A fatty complexion paste described in Table 14 is prepared and compared to a product prepared with ordinary coated powders. The "SEPIFEEL ONE" content of each product is 2.0%.

TABLE 14

  Proportion (%) Coated Powder Coated Powder of Example 2 Comparative Example 3 1. Excel Mica 12.00 As on the left 2. Synthetic phlogopite-fluorine 10.5 As on the left 3. Talc 18.10 16.10 4. Titanium dioxide 7.50 As on the left 5. Yellow iron oxide 1.90 As on the left 6. Red iron oxide 0.85 As on the left 7. Iron oxide 0.15 As on the left 8. Balls silica 5.00 As left 9. Copolymer polyethylene / polypropylene 4.00 As left 10. Carnauba wax 5.50 As left 11. Pentaerythritol resinate 6.50 As left 12. Cetyl Isooctanoate 12.00 As left 13. Propylene glycol Dicaprinate 7.00 As left 14. Liquid paraffin 3.50 As left 15. SEPIFEEL ONE - 2.00 16. SEPICIDE HB 0.30 As left Process Components 1 to 8 are dispersed and mixed.

  The components 9 to 16 are dissolved under heat at 110 ° C. The dispersed and mixed components 1 to 8 are added to them. The temperature is set at 80 ° C and the resulting mixture is melt-fed to the bottom of a cosmetic case to produce a greasy foundation.

  With regard to Examples 16 and 17 and Comparative Examples 14 and 15, the skin care effect and the anti-aging effect are examined by the foregoing methods. The results are shown in Table 15.

TABLE 15

  Conductivity Skin Condition Relative Relative Relative Elasticity Powder Foundation of Example 16 137% +23 126% Powder Foundation Example 124% +110% Comparative 14 Fatty Foundation of Example 17 135% +21 130% Fatty foundation of Comparative Example 120% +10 108% According to the results of Example 15, it is found that the incorporation of "SEPIFEEL ONE" into the foundation under the The form of the coated powder of the invention has a greater skin-care and anti-aging effect than those exerted by incorporating a simple additive into the foundation.

  The advantageous effects of the present invention are summarized in the following.

  As indicated above, with the powder coated with the mixture (lipoamino acid composition) of the specific acylated amino acid and the fatty acid of the invention, when it is used while being incorporated into cosmetics the skin care effect and the pronounced anti-aging effect are noticeable, and the coated powder is very useful for producing better cosmetics than ordinary products.

  It will be understood that the embodiments described herein are illustrative only and that variations and modifications can be made without departing from the scope of the present invention. 15

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Claims (11)

  A coated powder which can be used in cosmetics, characterized in that a powder is coated with a mixture (lipoamino acid composition) comprising N-acyl derivatives of the amino acids specified in sections (1) to (3) and at least one fatty acid selected from fatty acids having a carbon number of at least 12 and at most 22: (1) at least one amino acid selected from proline 10 and hydroxyproline, (2) at least one amino acid selected from alanine, glycine and sarcosine, and (3) at least one amino acid selected from aspartic acid and glutamic acid.   2. coated powder according to claim 1, characterized in that at least a portion of the N-acylamino acids is in the form of a salt.   3. Coated powder according to claim 1 or 2, characterized in that at least a portion of the fatty acid is in the form of a metal salt.   Coated powder according to any one of claims 1 to 3, characterized in that the N-acyl group of said N-acylamino acids is a saturated aliphatic carboxylate group having a carbon number equal to at least 12 and not more than 22.   5. Coated powder according to any one of claims 1 to 4, characterized in that the amino acid (1) is proline.   6. The coated powder according to any one of claims 1 to 5, characterized in that the amino acid (2) is sarcosine.   7. Coated powder according to any one of claims 1 to 6, characterized in that the amino acid (3) is glutamic acid.   8. coated powder according to any one of claims 1 to 7, characterized in that said fatty acid is at least one acid selected from lauric acid, myristic acid, palmitic acid and stearic acid.   9. The coated powder according to any one of claims 1 to 8, characterized in that the N-acyl group of said N-acylamino acids is a palmitoyl group.   10. Coated powder according to any one of claims 1 to 9, characterized in that said mixture (composition of lipoamino acids) comprises 25 to 70% by weight of the N-acyl derivative of said amino acid (1), 5 to 50% by weight of the N-acyl derivative of said amino acid (2), 5 to 25% by weight of the N-acyl derivative of said amino acid (3) and 5 to 50% by weight of the aliphatic acid.   Cosmetic product characterized in that the coated powder according to any one of claims 1 to 10 is incorporated in an amount of 0.1% by weight or more.